Using kajal can lead to watery eyes, itchiness, and even allergies. When kajal is washed off during a bath, it can pass down the small and narrow opening between the eyes and the nose. This opening can get blocked, causing infections.

Most commercially produced kajal and surma brands contain high levels of lead that is harmful for your baby. The ingredients or packaging could also be contaminated if safety and hygiene norms haven't been followed. Even if some brands claim they are lead-free or 100 per cent natural it's difficult to be sure and they may be just as unsafe.

Prolonged application may result in excessive lead storage in the body. This could affect your baby's brain, organs and bone marrow formation. Some experts think that lead poisoning can also result in anaemia, low IQ and convulsions.

Also, the cornea or the central, black part of the eye, is very sensitive to dirt and irritation. Dirty fingers, sharp and uneven fingernails can hurt a baby’s eyes. Prolonged or repeated exposure to lead may cause pain and discomfort, and in severe cases, can also affect your baby's vision.

Applying kajal to a newborn's eyes is an age old tradition practised in many parts of the country. Well-meaning relatives and friends may advise you to apply surma or kajal to your newborn's eyes to ward off the evil eye or buri nazar. According to an old wives' tale, applying kajal or surma will help your baby's eyes become bright, large and attractive. But there is no evidence to suggest this is true.

If you wish to apply kajal or surma on your baby, why don't you try applying it somewhere other than the eye? Some mums put a small tika on the sole of the foot, behind one of the ears or at the hairline on the forehead. These are safer options.